%I #7 Sep 09 2012 14:51:36

%S 2,7,11,17,23,29,31,37,43,53,59,67,71,79,89,101,139,151,157,173,181,

%T 191,193,211,223,227,233,251,277,281,307,311,313,331,337,349,359,373,

%U 383,389,397,401,409,419,421,433

%N Primes p such that 61 is not a square mod p.

%H Vincenzo Librandi, <a href="/A038942/b038942.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Prime@Range[120], JacobiSymbol[61, #] == - 1 &] (* _Vincenzo Librandi_, Sep 09 2012 *)

%o (PARI) select(n->!issquare(Mod(61,n)),primes(100)) \\ _Charles R Greathouse IV_, Sep 09 2012

%K nonn

%O 1,1

%A _N. J. A. Sloane_.

%E Offset changed from 0 to 1 by _Vincenzo Librandi_, Sep 09 2012